Study of Integrated Control Strategy for On Ramp of Urban Expressway and Interrelated Urban Road

An integrated control strategy of urban expressway and traffic signal control is proposed in this article. The object is to minimize the total travel time of vehicles on ramp and intersections based on the precondition that expressway is unblocked. The model used in this article has the following features: firstly, the input flow to a segment is set to be zero when its density has achieved jam density; the second, ALINEA control approach is adopted for ramp study so that expressway is ensured to be unblocked; the last, the cycle and green time of intersection can be optimized dynamically to maximum the whole benefit of expressway and surface street. The model and the control approach have been illustrated via a simple case study, which shows that integrated control approach proposed in this paper resulted in a reduction of the total travel time compared to fixed-time control